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, � 9 <br /> PUMP SELECTION PROCEDURE <br /> 4. Determine pump capacity: <br /> Gravity Distribution <br /> 1. Minimum suggested is 20 gpm <br /> 2. Maximum suggested is 45 gpm Perforation Discharges in GPht <br /> Piessure D15tibutlOn I-iead .Perforation diameter <br /> feet inches <br /> 3. a. Select number of perforated laterals 7/32 1/4 <br /> b. Select perforation spacing= feet. 1.oa o.sb o.�4 <br /> c. Subtract 2 ft. from the rock layer length. i.5 0.69 0.90 <br /> R«�iay«ia,gw-2 ft. = feet. <br /> 2.06 0.80 1.04 <br /> d. Determine the number of spaces between perforations. a Use 1.o Eooc single homes. <br /> Length perf.spacing= ft.= ft. = spaces b Use 2.0 feet for anything else. <br /> e. spaces+1 = perforations/lateral <br /> f. Multiply perforations per lateral by number of laterals to <br /> get total number of perforations. ��5 x �f5���= perforations. <br /> g. � x�m��= gpm. <br /> SELECTED PUMP CAPACITY_��gpm <br /> B.Determine head requirements: <br /> 1. Elevation difference between pump and point of discharge. <br /> ��feet <br /> 2. If pumping to a pressure distribution system,five feet for pressure SoJ teacnent system <br /> required at manifold if gravity s tem,zero. °�°'"`-'�°� <br /> � feet row P��i�,gw <br /> 3. FricHon loss <br /> a. Enter friction loss table with gpm and pipe diameter. we �- ��„tio„�;r��,�„�e <br /> Read fricti n loss in feet per 100 feet from table(F-14). P`� - <br /> ------- -- - <br /> F.L._ , ft./100 ft of pipe <br /> ................. . . <br /> b. Determuie total pipe length from pump to discharge -�"-"-'-��"�--�"-�"--'-�""�""'""""" <br /> point. Estimate by adding 25 percent to pipe length for fitting <br /> loss,or use a fitting loss chart(F-15 feet). <br /> Equivalent pip��th-125 times pi e length= <br /> X 125=�_feet Friction Loss in Plastic Pipe <br /> c. Calculate total friction loss by multiplying <br /> friction loss in ft/100 t b equi le t ipe length. � Nominal <br /> Z pipe dia. <br /> Total friction loss= x • =100= z feet <br /> F1ow Rate <br /> 4. Total head required is the sum of elevation difference, �m 1.5" 2" 3" <br /> special head requirements,and total friction los . <br /> � 20 2.47 0.73 0.11 <br /> �+�+ Z Z 25 373 1.11 0.16 <br /> (1) (2) (3c) 30 5.23 1.55 0.23 <br /> � 35 6.% 2.06 0.30 <br /> �feet 40 8.91 2.64 0.39 <br /> TOTAL HEAD 45 11.07 328 0.48 <br /> 50 13.46 3.99 0.58 <br /> C. Pump selection bo 5.60 o s� <br /> 65 6.48 0.95 <br /> 70 7.44 1.09 <br /> 1. A pump must be selected o deliver at least <br /> �gpm (Step A) with at least Z feet of total head (Step B). <br />